要想真正学好英语，一定要精通掌握时态方面的语法知识，英语时态一共有16种，每一种时态都会有对应的时间标志词。现在完成时是比较难的一种时态，它的时间标志词通常包含以下几种：

1、before 以前

例句：Have you been to the Great Wall before?

译文：你以前去过长城吗？

例句：Mike has seen the film with me before.

译文：迈克以前和我看过那部电影。

2、ever 曾经

例句：Have you ever been to Beijing?

译文：你曾去过北京吗？

例句：Mary has ever read the story.

译文：玛丽曾经读过那本小说。

3、never 从不

例句：Mike has never heard of that man.

译文：迈克从来没有听说过那个男人。

例句：They have never seen these wild animals.

译文：他们从未见过这些野生动物。

4、just 刚刚

例句：She has just eaten breakfast.

译文：她刚刚吃过早饭。

例句：I have just learned how to drive a car.

译文：我刚刚学会如何开车。

5、recently 近来，最近

例句：Mary has recently returned home from Shanghai.

译文：玛丽最近从上海返家了。

例句：Have you seen Mike recently?

译文：你最近看见过迈克吗？

6、yet 已经，仍然，还

例句：They haven't yet won a match.

译文：他们还未赢得一场比赛。

例句：Has she arrived yet?

译文：她已经到了吗？

7、already 已经

例句：They have already arrived at the park.

译文：他们已经到达公园。

例句：He has already agreed to help you solve the problem.

译文：他已经同意帮你解决那个问题了。

8、since 自从

例句：They haven't seen Mary since 2020.

译文：他们自从2020年起就没有见过玛丽了。

例句：She has changed a lot since she graduated.

译文：自从她毕业后已经改变了许多。

9、so far 到目前为止

例句：She has learned five languages so far.

译文：到目前为止，她已经学会了五种语言。

例句：I haven't been to the Great Wall so far.

译文：到目前为止，我还没有去过长城。

10、for+时间段

例句：He has lived here for ten years.

译文：他在这里已经住了10年了。

例句：I have read the book for three hours.

译文：我已经读了三小时的书了。

11、in the past+时间段

例句：Mike has earned a lot of money in the past five years.

译文：迈克在过去的五年里赚了许多钱。

例句：I have read four books in the past three weeks.

译文：我在过去的三周里读了四本书。

以上就是现在完成时的时间标志词，希望大家一定要记住。